Investigating Gas Diffusion Electrode Flooding in CO2Electrolysis With an Operando Water Trap System: The Role of (Bi)carbonate Salt Precipitation

Rottmann DM, Kollmuss R, Haufe S, Sajevic U, Mayrhofer K (2025)

Publication Type: Journal article

Publication year: 2025

Journal

Journal of The Electrochemical Society Electrochemical Society

Book Volume: 172

Article Number: 106505

Journal Issue: 10

DOI: 10.1149/1945-7111/ae0a84

Abstract

The electrochemical reduction of CO2 (CO2 electrolysis) is a promising technology for not only reducing CO2 emissions, but also contributing to a circular carbon economy. However, industrial feasibility has not been achieved yet, as flooding of the gas diffusion electrode (GDE) limits the long-term stability of CO2 electrolysis. Although (bi)carbonate salt precipitation is often considered to be one of the main factors accelerating GDE flooding, direct evidence of this effect is still lacking and further investigations are needed. In this study, we address this gap by employing an operando water trap to quantify GDE flooding in a time-resolved manner. The results demonstrate a direct correlation between salt precipitation and GDE flooding, as (bi)carbonate catholytes show increased GDE flooding rates. Additionally, the bicarbonate anion (HCO3−) was identified as the harmful species, independent of the catholyte’s pH. However, GDE flooding still occurs even when bicarbonate formation is mitigated, albeit at a much slower rate, indicating the need to investigate additional contributing factors.

Authors with CRIS profile

Karl Mayrhofer Lehrstuhl für Elektrokatalyse (HIERN)

Involved external institutions

Wacker Chemie AG DE Germany (DE) Forschungszentrum Jülich / Research Centre Jülich (FZJ) DE Germany (DE)

How to cite

APA:

Rottmann, D.M., Kollmuss, R., Haufe, S., Sajevic, U., & Mayrhofer, K. (2025). Investigating Gas Diffusion Electrode Flooding in CO2Electrolysis With an Operando Water Trap System: The Role of (Bi)carbonate Salt Precipitation. Journal of The Electrochemical Society, 172(10). https://doi.org/10.1149/1945-7111/ae0a84

MLA:

Rottmann, Daniel M., et al. "Investigating Gas Diffusion Electrode Flooding in CO2Electrolysis With an Operando Water Trap System: The Role of (Bi)carbonate Salt Precipitation." Journal of The Electrochemical Society 172.10 (2025).

BibTeX: Download